I think it looks off because of the leg separation to the torso idk
Some other things I would suggest is giving more to the scene or describing it better. I don’t really understand what it’s about just by looking at it. I see pillars, person posing, orbs, some opening in the back, and two symbols which I’ve never recognized. Don’t get me wrong it’s not bad at all, I like the blue color in the background, I just think it could use more
A few things I would do are…
Add more to the character (accessories, face, etc.)
Maybe add glow to the symbols and change their look
Change up the floating glowing white spheres, they don’t make much sense
Add more to the shot which gives a better understanding
Customize the pillars, add imperfections, cracks, make them different from each other
Color or add texture the walls, floor, and ceiling
Overall I hope this helps and your GFX work goes well!